Here is the full list of all 38 Hero of the Kingdom achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Destroy the Dark Lord.
Fight 12 battles.
Find 300 mushrooms.
Find 60 lost crates and barrels.
Catch 160 fish.
Make 25 sun solutions.
Pick 45 herbs.
Own 5,000 gold coins.
Hunt down 65 wild animals.
Find 12 treasures.
Help two ghosts.
Rest 50 times in a camp.
Find 140 eggs.
Have 350 fame.
Gather 15 barrels of algae.
Find 12 pearls.
Learn an expert skill.
Gather 40 sacks of night flowers.
Hunt down 25 wild animals.
Heal five people.
Build or repair 10 structures.
Find father.
Own 500 gold coins.
Find 30 lost crates and barrels.
Catch 80 fish.
Find 25 crayfish.
Get a boat.
Become a soldier.
Have 100 fame.
Find 150 mushrooms.
Learn an advanced skill.
Finish the water mill.
Learn three skills.
Get a weapon.
Make a barter.
Leave the home farm.
Saw 10 pieces of wood.
Get working tools.